Rotary pump



y 1945. A. VON WANGENHEIM 2,377,299

ROTARY PUMP Original Filed Nov 19,, 1942 FIG. I

FIG 4 LUINVENTOR M ATTORNEY.

Patented May 29, 1945 UNITED STATES PATENT OF FICE ROTARY rum Adolf vonWangenhcim, Detroit, hitch. assignor to Detroit Lubricator Company,Detroit, Mich, a corporation of Michigan Original application November19, 1942, Serial no.

Divided and this application March 1c, 1944, Serial No. 526,750

Claims. (circa-21s) This invention relates to ne and useful improvementsin rotary pumps and more particularly to pump supporting and sealingstructure.

An object of the invention is to provide a pump structure which may bereadily assembled with accuracy in commercial quantity production.

Another object is to provide eificient means for sealing a pump casingaround the drive shaft.

Another object is to eliminate strain or warpage of the pump casing uponclamping of the same to its supporting structure.

Other and further objects will be apparent from the followingdescription.

The invention consists in the improved construction of parts and theircooperative relation to be more fully described hereinafter, and thenovelty of which will be particularly pointed out V showinternalconstruction, and

Fig. 3 is a detail view in section on the line 3-3 of Fig. 2.

Fig. 4 is a detail of the frictional clamping means.

Referring to the drawing by'characters of-reference, l designatesgenerally a body or housing member having a chamber 2 formed by acuplike cover member 3 having a surrounding flange t which seats in andagainst the base of an annular recess in a flat chamber wall 5.Extendingv from the wall 5 and away from the chamber 2, there is ahollow extension .8 having a bore 1 extending longitudinallytherethrough. The bore 1 hasacylindrical portion 1" opening into thechamber 2 through substantially the middle pointcf the wall 5 and has,intermediate its ends, an enlarged diameter portion 8 and a bearing orguide portion .9 of reduced diameter relative to the diameter of thebore portion 1*. Within the chamber 2 there i -a. pump casing It havingend closure plate members i I, l 2 between which there is clamped ahollow annular stator member IS. The end closure member l2 has anexternal flat face it which seats against the flat wall 8.Projecting'from the face it there is. a hollow extension it whichextends through the bore I and fits the guide portion 8.v The'extension' li, ex

cept for its flt in the portion 8, is in oircumferentially spacedrelation to the wall of the bore 1 so as to provide for liquid flow inthe bore I around the extension l5. The passageways l6 are provided inthe wall of the hollow extension 6 to permit communication betweenopposite sides of the portion 9. Joumaled in the pump casing extensioni5 and projecting therefrom, there is a pump drive shaft il whichextends out of the housing extension 8. Surrounding the shaft H andscrew-threaded, as at It, into the outer end of the bore 1. there is aclosure member is which tightly clamps the marginal edge portion of asealing member" against an outward facing shoulder 2| in the extension6. The member 20 is preferably of flexibly resilient sheet material,such, for example, as Ameripol having inserted fabric. On the shaft iithere is a two-part thrust member 22 which has a rotary fit on the shaftI1 and between the parts of which there is tightly clamped the innerperipheral portion of the annular sealing member 20. The thrust member22 is urged toward the extension l5 by a coil spring 28 which abutsagainst the closure member ID and urges the thrust member l5 to take thethrust of spring 23.

The drive shaft l7 extends through the casing ID in eccentric relationto the internally cylindrical surface of the stator member l3 and isjournaled in the end'closure member ll. Keyed on the shaft l1 andfitting between the closure members III ii, there is a rotor 28 ofannular form and concentric with shaft ii. The rotor 29 has tangentialengagement with the cylindricalsurface of stator it as at 30, see Fig.1.

Accurate tangential sliding fit is provided by cut or formed to providea diametrical flat portion which, being-transverse to the abovementioned extended line, will permit slight radial movement of thestator toward and irom the rotor. Any such radialmovement is. however.prevented after tight tangential contact is obtained and this isaccomplished bymeans of the pin 32 which has a tight fit in alinedapertures in the closure members H and i2 and also has a tight flt inthe bore of a bushing 33, which bore is alined with the closure memberapertures. .The

bushing bore is drilled or formed after the rotor and. stator are intight tangential contact so that shaft l1 and in the opposite faces ofthe rotor. In

- the grooves 35 there are ring members'38 which support the inner endsof the vane members 31 and hold them in contact withthe eccentric in-.

ternally cylindrical face of the stator l3.

Opening from chamber 2 into the end closure 7 member 8! substantiallyparallel to the plane'of the rotor 29, there is an inlet conduit 39which terminates adjacent-the point of tangential contact 30 and inregistry with across passage 40 in the stator I3 and the abutting porton of mem-. ber IL, This cross passage flilopens into the. pump inletport which is in the form of arcuate recesses 4| in the inner faces ofthe end members ii, I2, respectively, and which are in registry with thecrescent-shaped space between the rotor and the stator. n the oppositeside of the point 30 from inlets M, there isan exhaust or outlet portwhich comprises arcuate recesses 65 in the members H and I2. 3 From theexhaust recess 36 in plate member [2, see Fig.3, there isan exhaustoutlet port 52 which opens through the closure member face M intoregistry with an outlet passageway 53 opening through .the fiat chamberwall 5 of the housing ,member I, The exhaust so that the vane members 31are urged by pump pressure against the stator wall.

' asrmeo strainer member II being or an external diameter to provide aclearance space around its external circumference within the covermember 55. This strainer member may be composed of an inner cylinder offoraminous material 59, such as wire screening, which serves as a'baseor support for a cylindrical pad of filter material 50. The cover member3 is tightly clamped and sealed in position against the wall 5 by meansof clamping screws 6| which engage the cover member flange 4. The fuelinlet to the housing member i aroimd the strainer member 58 is through aport 53 which opens through the wall 5 from an inlet passage- 7 way inthe housing member I and connected to a pipe 64 leading from the sourceof fuel supply. 7

The pump outlet 53 may connect to a. pressure regulatingvalve 66 havinga by-pass return conduit 18 leading into the housing member 6 forconnection therein either to a return pipe 8'2 leading back to thesource of fuel supply or to a port 85 discharging into the cover member2 around 7 the strainer member 58.- J

This application is a division of my copending application Serial No.466,116, filed November 19, 1942, for Pump and pressure control means.

Having thus described my invention, what is claimed :and is desired tobe secured by Letters Patent of the United States is:

1; ,A device of the character described, comprising a housing memberhaving a chamber and a bore opening thereinto through a flat chamberwell, said bore having a reduced diameter guide portion spacedfrom saidchamber, a pump casing in said chamber and having a flat face and ahollow extension projecting from said face and fitting said guideportion, pump means in said pump casing a pump drive shaft extendingthrough said extension and operatively connected to said pump means, andmeans frictionally clamping said casing to said wall with said faceseating tightly againstsaid well, said frictional clampingand'saidspacedguide portion cooperatto eliminate substantially any flexing ofsaid port or passage 52 is in communication. through a conduit 54 withone of the annular grooves 36 ,"The pump casing in is secured rigidly inposition and with the face 14 in tight sealing engagement with the flatchamber walls so that the pump casing seals communication between thebore I and the chamber 2. This is accomplished,

' see Fig. '4, by frctionally clamping the casing II) to the wall 5 bymeans of screws 56, the screws being of smaller diameter than the holes51 through the casing I0 through which thescrews casing- 2. a device inga housing member having a chamber and a bore opening thereintothrough aflat chamber wall, said bore having a reduced diameter guide portionspaced from said chamber, a pump casing in said chamber and having afiat face and a hollow extension projecting from said face and fittingsaid guide portion, pump means in said pump casing a, pump drive shaftextending through said extension and operatively connected to said pumpmeans, means frictionally clamping said casing to said wall with saidface seating 1 tightly against said wall, said frictional clamping 56pass, so that the extension iii can be accurately 1 Within the chamber2, there is a strainer-mam 1 bar 58 of cylindrical form whichflts overthe:

closure plate member l2, which is of somewhat larger diameter'than theexternal dameter of.

the stator l3 and closure member Ii, so as to provide spacing betweenthe pump casing and the "internal diameter of the strainer member 58.

The housing cover member 3 engages one end face I or the strainermembers: and holds it tightly clamped against the flat chamber wall 5,the

. alined with the guide portion 9, thereby eliminating any flexing orsetting up of twisting stresses in the casing 10.

and said spaced guide portion cooperating to eliminate substantially anyflexing of said casing. and

. means sealing said shaft to saidhousing member closely adjacent saidguide portion so that saidguide portion willhold said shaft laterally incooperative relation to said sealing means upon clamping of said casingface to said chamber wall.'.

3. A device of the character described, comprising a housing memberhaving a chamber and a bore opening thereinto through a flat chamberwall, said bore a reduced diameter guide portion spaced from saidchamber, a pump casing in'said chamberand having a flat face and ahollow extension projecting from said face and fitting said guideportion, pump means in said pump casing,'a pump drive shaft extendingextension, and operatively connected of the character described,compris- I toaaidpumpmcanameansrrictionallyclampingsaidcasingtosaidwallwithsaidiaceseating ishtlyagainstsaid wall, saidirictional clambiml, and said spaced guide portion cooperating toeliminate substantially any flexing of said casina'. a collar on'saidshaft and abutting said extension on the opposite sideoi' said guideportion from said chamber, and annular flexible sealing meanssealedtosaidhouaingandrotatabiy nttinz said shaft, said sealing meanslongitudinally abut. ting said collar, and spring means using saidsealin: means against said collar.

4. a device of the character described, comprissaid" housing memberhaving cooperabie outlet passageways opening through said flat casingrace and said flat wall.

5. A device of the character described, compris--ingahousingmemberhavingachamberanda bore opening into said chamberthrough a flat chamber wall, said bore having a reduced diameter guideportion spaced from said chamber, a pump casing in said chamber andhaving end plates, one of said plates having a flat {ace and a hollowextension projection from said face and ntuni said guide portion, adrive shaft extending into said pump casing thrown said extension,

means Irictionaliy clamping said casing race tightly against saidjwall,pumping means on said shaft and within said pump casing, a strainerwithin said housing member and surrounding said pump casing, saidpump'casing, having an'inlet from said chamber, said housing memberhaving saidchamber, said housing member having an inlet to said chamber.and said pump casing and an inlet to said chamber external 01 saidstrainer, and said pump casing and said housing member having cooperableoutlet passageways opening through said flat casing face and said flatwall.v

snot-r voir wane.

